參數(shù)資料
型號： MB90F549
廠商： Fujitsu Limited
英文描述： 16-bit Proprietary Microcontroller
中文描述： 16位微控制器專有
文件頁數(shù)： 41/56頁
文件大?。?/td> 757K
代理商： MB90F549
MB90540/545 Series
41
(4) Power On Reset
(V
CC
=
5.0 V
±
10%, V
SS
=
AV
SS
=
0.0 V, T
A
=
40
°
C to
+
85
°
C)
Value
Units
Min.
Max.
Note
V
CC
must be kept lower than 0.2 V before power-on.
The above values are used for creating a power-on reset.
Some registers in the device are initialized only upon a power-on reset. To initialize these register, turn on
the power supply using the above values.
Parameter
Symbol
Pin
Condition
Remarks
Power on rise time
t
R
V
CC
—
0.05
30
ms
Power off time
t
OFF
V
CC
50
—
ms
Due to repetitive operation
t
R
2.7 V
0.2 V
V
CC
0.2 V
0.2 V
t
OFF
Sudden changes in the power supply voltage may cause a power-on reset.
To change the power supply voltage while the device is in operation, it is recommended to
raise the voltage smoothly to suppress fluctuations as shown below.
In this case, change the supply voltage with the PLL clock not used. If the voltage drop is
1 V or fewer per second, however, you can use the PLL clock.
V
CC
V
SS
TBD
RAM data being held
It is recommended to keep the
rising speed of the supply voltage
at 50 mV/ms or slower.
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